1994712521 has 2 divisors, whose sum is σ = 1994712522. Its totient is φ = 1994712520.

The previous prime is 1994712487. The next prime is 1994712563. The reversal of 1994712521 is 1252174991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1628526025 + 366186496 = 40355^2 + 19136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994712521 - 2⁶ = 1994712457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994717521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997356260 + 997356261.

It is an arithmetic number, because the mean of its divisors is an integer number (997356261).

Almost surely, 2^1994712521 is an apocalyptic number.

It is an amenable number.

1994712521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994712521 is an equidigital number, since it uses as much as digits as its factorization.

1994712521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 1994712521 is about 44662.2046141925. The cubic root of 1994712521 is about 1258.8097689909.

The spelling of 1994712521 in words is "one billion, nine hundred ninety-four million, seven hundred twelve thousand, five hundred twenty-one".